feat(ios): iPad → iPad screen mirroring (#123)#144
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…on (#123) The iOS app gains a sender role: a ReplayKit broadcast upload extension captures the whole screen, H.264-encodes it (VideoToolbox, same low-latency settings as the Mac sender) and streams it over the existing framed-TCP wire protocol, so the receiver app works unchanged. The app's new Send screen discovers receivers over Bonjour (peer-to-peer enabled, so no shared WiFi needed) and hands the chosen target to the extension via app-group defaults. Mirror-only and view-only by platform constraint: iPadOS has no virtual display primitive and no event injection.
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Closes #123 — the iOS app learns to send: mirror this iPad/iPhone's screen to another device running OpenDisplay.
Why: People with a spare iPad want it as a second screen for their main iPad — the sender half was Mac-only until now.
How: A ReplayKit broadcast upload extension (the only sanctioned whole-screen capture on iOS) runs the sender pipeline — VideoToolbox H.264 with the Mac sender's low-latency settings, streamed over the existing framed-TCP wire — so the receiver app works unchanged and can't tell a Mac from an iPad on the other end. A new "Send this screen" sheet in the app picks the receiver over Bonjour (peer-to-peer enabled, so no shared WiFi needed) and hands the target to the extension via app-group defaults. Deliberate call: mirror-only and view-only — iPadOS has no virtual-display primitive (no extend) and no event injection (no touch back-channel), so receiver touches are simply ignored.
Verified by building app+extension (simulator) and the Mac target; a live two-device run is still needed. Note for the first signed build: the new App Groups capability means Xcode (signed in) must regenerate the provisioning profiles once — headless xcodebuild can't. Release signing (TestFlight workflow) will need the same capability on the App Store profile.